Reduction gear



FIG. 1 is a front perspective view of our new design for a reduction gear;

FIG. 2 is a rear perspective view of FIG. 1;

FIG. 3 is a left side elevation view of FIG. 1;

FIG. 4 is a right side elevation view of FIG. 1;

FIG. 5 is a front side elevation view of FIG. 1;

FIG. 6 is rear side elevation view of FIG. 1;

FIG. 7 is a top plan view of FIG. 1; and,

FIG. 8 is a bottom plan view of FIG. 1.

The broken lines in the drawings depict unclaimed environmental subject matter. 

CLAIM The ornamental design for the reduction gear, as shown and described. 